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/*
* arm cpu init and loop
*
* Copyright (c) 2013 Stacey D. Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _TARGET_ARCH_CPU_H_
#define _TARGET_ARCH_CPU_H_
#include "target_arch.h"
#include "signal-common.h"
#define TARGET_DEFAULT_CPU_MODEL "any"
static inline void target_cpu_init(CPUARMState *env,
struct target_pt_regs *regs)
{
int i;
cpsr_write(env, regs->uregs[16], CPSR_USER | CPSR_EXEC,
CPSRWriteByInstr);
for (i = 0; i < 16; i++) {
env->regs[i] = regs->uregs[i];
}
}
static inline void target_cpu_loop(CPUARMState *env)
{
int trapnr, si_signo, si_code;
CPUState *cs = env_cpu(env);
for (;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch (trapnr) {
case EXCP_UDEF:
case EXCP_NOCP:
case EXCP_INVSTATE:
/*
* See arm/arm/undefined.c undefinedinstruction();
*
* A number of details aren't emulated (they likely don't matter):
* o Misaligned PC generates ILL_ILLADR (these can't come from qemu)
* o Thumb-2 instructions generate ILLADR
* o Both modes implement coprocessor instructions, which we don't
* do here. FreeBSD just implements them for the VFP coprocessor
* and special kernel breakpoints, trace points, dtrace, etc.
*/
force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->regs[15]);
break;
case EXCP_SWI:
{
int ret;
abi_ulong params = get_sp_from_cpustate(env);
int32_t syscall_nr = env->regs[7];
int32_t arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8;
/* See arm/arm/syscall.c cpu_fetch_syscall_args() */
if (syscall_nr == TARGET_FREEBSD_NR_syscall) {
syscall_nr = env->regs[0];
arg1 = env->regs[1];
arg2 = env->regs[2];
arg3 = env->regs[3];
get_user_s32(arg4, params);
params += sizeof(int32_t);
get_user_s32(arg5, params);
params += sizeof(int32_t);
get_user_s32(arg6, params);
params += sizeof(int32_t);
get_user_s32(arg7, params);
arg8 = 0;
} else if (syscall_nr == TARGET_FREEBSD_NR___syscall) {
syscall_nr = env->regs[0];
arg1 = env->regs[2];
arg2 = env->regs[3];
get_user_s32(arg3, params);
params += sizeof(int32_t);
get_user_s32(arg4, params);
params += sizeof(int32_t);
get_user_s32(arg5, params);
params += sizeof(int32_t);
get_user_s32(arg6, params);
arg7 = 0;
arg8 = 0;
} else {
arg1 = env->regs[0];
arg2 = env->regs[1];
arg3 = env->regs[2];
arg4 = env->regs[3];
get_user_s32(arg5, params);
params += sizeof(int32_t);
get_user_s32(arg6, params);
params += sizeof(int32_t);
get_user_s32(arg7, params);
params += sizeof(int32_t);
get_user_s32(arg8, params);
}
ret = do_freebsd_syscall(env, syscall_nr, arg1, arg2, arg3,
arg4, arg5, arg6, arg7, arg8);
/*
* Compare to arm/arm/vm_machdep.c
* cpu_set_syscall_retval()
*/
if (-TARGET_EJUSTRETURN == ret) {
/*
* Returning from a successful sigreturn syscall.
* Avoid clobbering register state.
*/
break;
}
if (-TARGET_ERESTART == ret) {
env->regs[15] -= env->thumb ? 2 : 4;
break;
}
if ((unsigned int)ret >= (unsigned int)(-515)) {
ret = -ret;
cpsr_write(env, CPSR_C, CPSR_C, CPSRWriteByInstr);
env->regs[0] = ret;
} else {
cpsr_write(env, 0, CPSR_C, CPSRWriteByInstr);
env->regs[0] = ret; /* XXX need to handle lseek()? */
/* env->regs[1] = 0; */
}
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_PREFETCH_ABORT:
case EXCP_DATA_ABORT:
/*
* See arm/arm/trap-v6.c prefetch_abort_handler() and
* data_abort_handler()
*
* However, FreeBSD maps these to a generic value and then uses that
* to maybe fault in pages in vm/vm_fault.c:vm_fault_trap(). I
* believe that the indirection maps the same as Linux, but haven't
* chased down every single possible indirection.
*/
/* For user-only we don't set TTBCR_EAE, so look at the FSR. */
switch (env->exception.fsr & 0x1f) {
case 0x1: /* Alignment */
si_signo = TARGET_SIGBUS;
si_code = TARGET_BUS_ADRALN;
break;
case 0x3: /* Access flag fault, level 1 */
case 0x6: /* Access flag fault, level 2 */
case 0x9: /* Domain fault, level 1 */
case 0xb: /* Domain fault, level 2 */
case 0xd: /* Permission fault, level 1 */
case 0xf: /* Permission fault, level 2 */
si_signo = TARGET_SIGSEGV;
si_code = TARGET_SEGV_ACCERR;
break;
case 0x5: /* Translation fault, level 1 */
case 0x7: /* Translation fault, level 2 */
si_signo = TARGET_SIGSEGV;
si_code = TARGET_SEGV_MAPERR;
break;
default:
g_assert_not_reached();
}
force_sig_fault(si_signo, si_code, env->exception.vaddress);
break;
case EXCP_DEBUG:
case EXCP_BKPT:
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->regs[15]);
break;
case EXCP_YIELD:
/* nothing to do here for user-mode, just resume guest code */
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
default:
fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
trapnr);
cpu_dump_state(cs, stderr, 0);
abort();
} /* switch() */
process_pending_signals(env);
} /* for (;;) */
}
static inline void target_cpu_clone_regs(CPUARMState *env, target_ulong newsp)
{
if (newsp) {
env->regs[13] = newsp;
}
env->regs[0] = 0;
}
static inline void target_cpu_reset(CPUArchState *env)
{
}
#endif /* !_TARGET_ARCH_CPU_H */
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